﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Demo02
{
    class Circle:Shape 
    {
        public int radius;
        public override void GetArea()
        {
            Console.WriteLine("圆的面积为："+ (radius * radius*3.14));
        }
    }
}
